Funny you should say that. I just left a comment on the new chapter saying if he doesn't smack her or at least severly reprimand her, I'm dropping. Guess I will be dropping this manga afterall, it had so much potential, too. I never read Harem or Drama manga, and this one never had those tags...
Honestly I'd say it all depends on who is using the ability, no matter what the power is. Look at Orihime, if someone like Aizen or Uruhara had her ability, they would be way too overpowered even compared to themselves, but Orihime was pretty much useless despite having an overpowered ability.
Is it just me, or are those abilities described as useless seem like they could be actually way over powered? Like the perception altering ability sounds an awful like Aizen Sousuke's shikai release.
When he said his knowledge comes from manga, my mind automatically went to the Double Lariat from Naruto. Then two pages later they do the move. Made me Lol.
I thought MC was supposed to be smart. Obviously it's the sound that is his weakness, not the lightning. Strong sense of smell, strong sense of hearing. He should just use his attack he used against them bats. I wonder if the author is intentionally making him become dumber for some reason.